209294090 has 8 divisors (see below), whose sum is σ = 376729380. Its totient is φ = 83717632.

The previous prime is 209294081. The next prime is 209294117. The reversal of 209294090 is 90492902.

It is a Cunningham number, because it is equal to 14467²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 209294089 + 1 = 14467^2 + 1^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×209294090² = 87608032217856200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 209294090.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10464695 + ... + 10464714.

Almost surely, 2^209294090 is an apocalyptic number.

209294090 is a deficient number, since it is larger than the sum of its proper divisors (167435290).

209294090 is a wasteful number, since it uses less digits than its factorization.

209294090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20929416.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 209294090 is about 14467.0000345614. Note that the first 4 decimals coincide. The cubic root of 209294090 is about 593.7254358813.

The spelling of 209294090 in words is "two hundred nine million, two hundred ninety-four thousand, ninety".